Guidelines for the Root (/) File System

As with any other system running the Solaris OS, you can configure the root (/), /var, /usr, and /opt directories as separate file systems. Or, you can include all the directories in the root (/)
file system. The following describes the software contents of the root (/), /var, /usr, and /opt directories in a Sun Cluster configuration. Consider this information when you plan your partitioning scheme.

root (/) – The Sun Cluster software itself occupies less than 40 Mbytes of space in the root (/) file system. Solaris Volume Manager software requires less than 5 Mbytes, and VxVM software requires less than 15 Mbytes. To
configure ample additional space and inode capacity, add at least 100 Mbytes to the amount of space you would normally allocate for your root ( /) file system. This space is used for the creation of both block special devices and character special devices used by the
volume management software. You especially need to allocate this extra space if a large number of shared disks are in the cluster.

/var – The Sun Cluster software occupies a negligible amount of space in the /var file system at installation time. However, you need to set aside ample space for log files. Also, more messages might be logged on a clustered node
than would be found on a typical standalone server. Therefore, allow at least 100 Mbytes for the /var file system.

/usr – Sun Cluster software occupies less than 25 Mbytes of space in the /usr file system. Solaris Volume Manager and VxVM software each require less than 15 Mbytes.

/opt – Sun Cluster framework software uses less than 2 Mbytes in the /opt file system. However, each Sun Cluster data service might use between 1 Mbyte and 5 Mbytes. Solaris Volume Manager software does not use any space in the /opt file system. VxVM software can use over 40 Mbytes if all of its packages and tools are installed.

In addition, most database and applications software is installed in the /opt file system.

SPARC: If you use Sun Management Center software
to monitor the cluster, you need an additional 25 Mbytes of space on each node to support the Sun Management Center agent and Sun Cluster module packages.